Honestly, I have no idea anymore. Shrug.
It will happen if they remove all old legendaries from loot tables.
I remember seeing a thread awhile back that I liked quite a bit.
There were two options:
A.) Make Legendaries x-mog-able, but the price to x-mog something into them would be 10k (maybe more).
B.) Pay 100k (maybe more) to permanently unlock the legendary skin for x-mog.
Blizz might just add some look alike items on the store and those items might be transmoggable to legendaries.
Stating an opinion as fact does not make it fact. Opinions are not fact. So don't be stupid and make a fool of yourself by trying to pass off your opinion as fact.